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  1. #1

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    crankcase scratches paint or let it be? pics included

    Rebuilding my yamaha 800 and the case has some scratches on the inside on the rear piston. Scratches arm from the needle bearings on the lower end of the rod breaking out and scratching. There's no major damage it just looks like paint was lost should I repaint it or leave it be? Thanks
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  2. #2

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    there shouldn't be any paint inside the crank. as long as the crank case seal tide and the scratching is not affecting the new crankshaft, let it be. clean it up though.

  3. #3

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    I was going to wet sand it with some 400 grit and call it a day. Thanks again birdgod

  4. #4

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    Yes, there is paint on the inside of many cases, mine were painted black inside. Its no big deal, just polish it if you want to clean it up and make sure nothing is left after. Be sure to inspect for cracks however, because it is a tight clearance between the case and crank, and a needle bearing could wedge and crack the case.

  5. #5

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    I did inspect for cracks on the inside and out.side of case. Everything looks fine. Now its time to clean up and use osidebills crank Install sticky.

  6. #6

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    Quote Originally Posted by LT1GMC View Post
    Yes, there is paint on the inside of many cases, mine were painted black inside. Its no big deal, just polish it if you want to clean it up and make sure nothing is left after. Be sure to inspect for cracks however, because it is a tight clearance between the case and crank, and a needle bearing could wedge and crack the case.
    Wow, that I didn't know I have haven't see one yet. Thanks for the info, I am learning new thing here everyday.

  7. #7
    Julian's Avatar
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    I had a case with some minor scratches.
    To prevent some oxidation in case of minor moist, i cleaned it, and painted it with 2-comp paint, fuel res. 350 degree celcius resistant.
    Most 66v cases are black coated.
    I dont think its a must, as long as its smooth, and not affecting the flat side where the cases come together.

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